text: /*
   * Zoran 364xx based USB webcam module version 0.73
   *
   * Allows you to use your USB webcam with V4L2 applications
   * This is still in heavy developpement !
   *
   * Copyright (C) 2004  Antoine Jacquet <royale@zerezo.com>
   * http://royale.zerezo.com/zr364xx/
   *
   * Heavily inspired by usb-skeleton.c, vicam.c, cpia.c and spca50x.c drivers
   * V4L2 version inspired by meye.c driver
   *
   * Some video buffer code by Lamarque based on s2255drv.c and vivi.c drivers.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  
  #include <linux/module.h>
  #include <linux/version.h>
  #include <linux/init.h>
  #include <linux/usb.h>
  #include <linux/vmalloc.h>
  #include <linux/slab.h>
  #include <linux/proc_fs.h>
  #include <linux/highmem.h>
  #include <media/v4l2-common.h>
  #include <media/v4l2-ioctl.h>
  #include <media/videobuf-vmalloc.h>
  
  
  /* Version Information */
  #define DRIVER_VERSION "v0.73"
  #define ZR364XX_VERSION_CODE KERNEL_VERSION(0, 7, 3)
  #define DRIVER_AUTHOR "Antoine Jacquet, http://royale.zerezo.com/"
  #define DRIVER_DESC "Zoran 364xx"
  
  
  /* Camera */
  #define FRAMES 1
  #define MAX_FRAME_SIZE 200000
  #define BUFFER_SIZE 0x1000
  #define CTRL_TIMEOUT 500
  
  #define ZR364XX_DEF_BUFS	4
  #define ZR364XX_READ_IDLE	0
  #define ZR364XX_READ_FRAME	1
  
  /* Debug macro */
  #define DBG(fmt, args...) \
  	do { \
  		if (debug) { \
  			printk(KERN_INFO KBUILD_MODNAME " " fmt, ##args); \
  		} \
  	} while (0)
  
  /*#define FULL_DEBUG 1*/
  #ifdef FULL_DEBUG
  #define _DBG DBG
  #else
  #define _DBG(fmt, args...)
  #endif
  
  /* Init methods, need to find nicer names for these
   * the exact names of the chipsets would be the best if someone finds it */
  #define METHOD0 0
  #define METHOD1 1
  #define METHOD2 2
  #define METHOD3 3
  
  
  /* Module parameters */
  static int debug;
  static int mode;
  
  
  /* Module parameters interface */
  module_param(debug, int, 0644);
  MODULE_PARM_DESC(debug, "Debug level");
  module_param(mode, int, 0644);
  MODULE_PARM_DESC(mode, "0 = 320x240, 1 = 160x120, 2 = 640x480");
  
  
  /* Devices supported by this driver
   * .driver_info contains the init method used by the camera */
  static struct usb_device_id device_table[] = {
  	{USB_DEVICE(0x08ca, 0x0109), .driver_info = METHOD0 },
  	{USB_DEVICE(0x041e, 0x4024), .driver_info = METHOD0 },
  	{USB_DEVICE(0x0d64, 0x0108), .driver_info = METHOD0 },
  	{USB_DEVICE(0x0546, 0x3187), .driver_info = METHOD0 },
  	{USB_DEVICE(0x0d64, 0x3108), .driver_info = METHOD0 },
  	{USB_DEVICE(0x0595, 0x4343), .driver_info = METHOD0 },
  	{USB_DEVICE(0x0bb0, 0x500d), .driver_info = METHOD0 },
  	{USB_DEVICE(0x0feb, 0x2004), .driver_info = METHOD0 },
  	{USB_DEVICE(0x055f, 0xb500), .driver_info = METHOD0 },
  	{USB_DEVICE(0x08ca, 0x2062), .driver_info = METHOD2 },
  	{USB_DEVICE(0x052b, 0x1a18), .driver_info = METHOD1 },
  	{USB_DEVICE(0x04c8, 0x0729), .driver_info = METHOD0 },
  	{USB_DEVICE(0x04f2, 0xa208), .driver_info = METHOD0 },
  	{USB_DEVICE(0x0784, 0x0040), .driver_info = METHOD1 },
  	{USB_DEVICE(0x06d6, 0x0034), .driver_info = METHOD0 },
  	{USB_DEVICE(0x0a17, 0x0062), .driver_info = METHOD2 },
  	{USB_DEVICE(0x06d6, 0x003b), .driver_info = METHOD0 },
  	{USB_DEVICE(0x0a17, 0x004e), .driver_info = METHOD2 },
  	{USB_DEVICE(0x041e, 0x405d), .driver_info = METHOD2 },
  	{USB_DEVICE(0x08ca, 0x2102), .driver_info = METHOD3 },
  	{USB_DEVICE(0x06d6, 0x003d), .driver_info = METHOD0 },
  	{}			/* Terminating entry */
  };
  
  MODULE_DEVICE_TABLE(usb, device_table);
  
  struct zr364xx_mode {
  	u32 color;	/* output video color format */
  	u32 brightness;	/* brightness */
  };
  
  /* frame structure */
  struct zr364xx_framei {
  	unsigned long ulState;	/* ulState:ZR364XX_READ_IDLE,
  					   ZR364XX_READ_FRAME */
  	void *lpvbits;		/* image data */
  	unsigned long cur_size;	/* current data copied to it */
  };
  
  /* image buffer structure */
  struct zr364xx_bufferi {
  	unsigned long dwFrames;			/* number of frames in buffer */
  	struct zr364xx_framei frame[FRAMES];	/* array of FRAME structures */
  };
  
  struct zr364xx_dmaqueue {
  	struct list_head	active;
  	struct zr364xx_camera	*cam;
  };
  
  struct zr364xx_pipeinfo {
  	u32 transfer_size;
  	u8 *transfer_buffer;
  	u32 state;
  	void *stream_urb;
  	void *cam;	/* back pointer to zr364xx_camera struct */
  	u32 err_count;
  	u32 idx;
  };
  
  struct zr364xx_fmt {
  	char *name;
  	u32 fourcc;
  	int depth;
  };
  
  /* image formats.  */
  static const struct zr364xx_fmt formats[] = {
  	{
  		.name = "JPG",
  		.fourcc = V4L2_PIX_FMT_JPEG,
  		.depth = 24
  	}
  };
  
  /* Camera stuff */
  struct zr364xx_camera {
  	struct usb_device *udev;	/* save off the usb device pointer */
  	struct usb_interface *interface;/* the interface for this device */
  	struct video_device *vdev;	/* v4l video device */
  	int nb;
  	struct zr364xx_bufferi		buffer;
  	int skip;
  	int width;
  	int height;
  	int method;
  	struct mutex lock;
  	struct mutex open_lock;
  	int users;
  
  	spinlock_t		slock;
  	struct zr364xx_dmaqueue	vidq;
  	int			resources;
  	int			last_frame;
  	int			cur_frame;
  	unsigned long		frame_count;
  	int			b_acquire;
  	struct zr364xx_pipeinfo	pipe[1];
  
  	u8			read_endpoint;
  
  	const struct zr364xx_fmt *fmt;
  	struct videobuf_queue	vb_vidq;
  	enum v4l2_buf_type	type;
  	struct zr364xx_mode	mode;
  };
  
  /* buffer for one video frame */
  struct zr364xx_buffer {
  	/* common v4l buffer stuff -- must be first */
  	struct videobuf_buffer vb;
  	const struct zr364xx_fmt *fmt;
  };
  
  /* function used to send initialisation commands to the camera */
  static int send_control_msg(struct usb_device *udev, u8 request, u16 value,
  			    u16 index, unsigned char *cp, u16 size)
  {
  	int status;
  
  	unsigned char *transfer_buffer = kmalloc(size, GFP_KERNEL);
  	if (!transfer_buffer) {
  		dev_err(&udev->dev, "kmalloc(%d) failed\n", size);
  		return -ENOMEM;
  	}
  
  	memcpy(transfer_buffer, cp, size);
  
  	status = usb_control_msg(udev,
  				 usb_sndctrlpipe(udev, 0),
  				 request,
  				 USB_DIR_OUT | USB_TYPE_VENDOR |
  				 USB_RECIP_DEVICE, value, index,
  				 transfer_buffer, size, CTRL_TIMEOUT);
  
  	kfree(transfer_buffer);
  
  	if (status < 0)
  		dev_err(&udev->dev,
  			"Failed sending control message, error %d.\n", status);
  
  	return status;
  }
  
  
  /* Control messages sent to the camera to initialize it
   * and launch the capture */
  typedef struct {
  	unsigned int value;
  	unsigned int size;
  	unsigned char *bytes;
  } message;
  
  /* method 0 */
  static unsigned char m0d1[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
  static unsigned char m0d2[] = { 0, 0, 0, 0, 0, 0 };
  static unsigned char m0d3[] = { 0, 0 };
  static message m0[] = {
  	{0x1f30, 0, NULL},
  	{0xd000, 0, NULL},
  	{0x3370, sizeof(m0d1), m0d1},
  	{0x2000, 0, NULL},
  	{0x2f0f, 0, NULL},
  	{0x2610, sizeof(m0d2), m0d2},
  	{0xe107, 0, NULL},
  	{0x2502, 0, NULL},
  	{0x1f70, 0, NULL},
  	{0xd000, 0, NULL},
  	{0x9a01, sizeof(m0d3), m0d3},
  	{-1, -1, NULL}
  };
  
  /* method 1 */
  static unsigned char m1d1[] = { 0xff, 0xff };
  static unsigned char m1d2[] = { 0x00, 0x00 };
  static message m1[] = {
  	{0x1f30, 0, NULL},
  	{0xd000, 0, NULL},
  	{0xf000, 0, NULL},
  	{0x2000, 0, NULL},
  	{0x2f0f, 0, NULL},
  	{0x2650, 0, NULL},
  	{0xe107, 0, NULL},
  	{0x2502, sizeof(m1d1), m1d1},
  	{0x1f70, 0, NULL},
  	{0xd000, 0, NULL},
  	{0xd000, 0, NULL},
  	{0xd000, 0, NULL},
  	{0x9a01, sizeof(m1d2), m1d2},
  	{-1, -1, NULL}
  };
  
  /* method 2 */
  static unsigned char m2d1[] = { 0xff, 0xff };
  static message m2[] = {
  	{0x1f30, 0, NULL},
  	{0xf000, 0, NULL},
  	{0x2000, 0, NULL},
  	{0x2f0f, 0, NULL},
  	{0x2650, 0, NULL},
  	{0xe107, 0, NULL},
  	{0x2502, sizeof(m2d1), m2d1},
  	{0x1f70, 0, NULL},
  	{-1, -1, NULL}
  };
  
  /* init table */
  static message *init[4] = { m0, m1, m2, m2 };
  
  
  /* JPEG static data in header (Huffman table, etc) */
  static unsigned char header1[] = {
  	0xFF, 0xD8,
  	/*
  	0xFF, 0xE0, 0x00, 0x10, 'J', 'F', 'I', 'F',
  	0x00, 0x01, 0x01, 0x00, 0x33, 0x8A, 0x00, 0x00, 0x33, 0x88,
  	*/
  	0xFF, 0xDB, 0x00, 0x84
  };
  static unsigned char header2[] = {
  	0xFF, 0xC4, 0x00, 0x1F, 0x00, 0x00, 0x01, 0x05, 0x01, 0x01, 0x01,
  	0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  	0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
  	0xFF, 0xC4, 0x00, 0xB5, 0x10, 0x00, 0x02, 0x01, 0x03, 0x03, 0x02,
  	0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7D, 0x01,
  	0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06,
  	0x13, 0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xA1,
  	0x08, 0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1, 0xF0, 0x24, 0x33,
  	0x62, 0x72, 0x82, 0x09, 0x0A, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x25,
  	0x26, 0x27, 0x28, 0x29, 0x2A, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
  	0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x53, 0x54,
  	0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67,
  	0x68, 0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A,
  	0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x92, 0x93, 0x94,
  	0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6,
  	0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8,
  	0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA,
  	0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE1, 0xE2,
  	0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xF1, 0xF2, 0xF3,
  	0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFF, 0xC4, 0x00, 0x1F,
  	0x01, 0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
  	0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04,
  	0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0xFF, 0xC4, 0x00, 0xB5,
  	0x11, 0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05,
  	0x04, 0x04, 0x00, 0x01, 0x02, 0x77, 0x00, 0x01, 0x02, 0x03, 0x11,
  	0x04, 0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
  	0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xA1, 0xB1, 0xC1,
  	0x09, 0x23, 0x33, 0x52, 0xF0, 0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16,
  	0x24, 0x34, 0xE1, 0x25, 0xF1, 0x17, 0x18, 0x19, 0x1A, 0x26, 0x27,
  	0x28, 0x29, 0x2A, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x43, 0x44,
  	0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57,
  	0x58, 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
  	0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x82, 0x83, 0x84,
  	0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96,
  	0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8,
  	0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA,
  	0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3,
  	0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE2, 0xE3, 0xE4, 0xE5,
  	0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
  	0xF8, 0xF9, 0xFA, 0xFF, 0xC0, 0x00, 0x11, 0x08, 0x00, 0xF0, 0x01,
  	0x40, 0x03, 0x01, 0x21, 0x00, 0x02, 0x11, 0x01, 0x03, 0x11, 0x01,
  	0xFF, 0xDA, 0x00, 0x0C, 0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11,
  	0x00, 0x3F, 0x00
  };
  static unsigned char header3;
  
  /* ------------------------------------------------------------------
     Videobuf operations
     ------------------------------------------------------------------*/
  
  static int buffer_setup(struct videobuf_queue *vq, unsigned int *count,
  			unsigned int *size)
  {
  	struct zr364xx_camera *cam = vq->priv_data;
  
  	*size = cam->width * cam->height * (cam->fmt->depth >> 3);
  
  	if (*count == 0)
  		*count = ZR364XX_DEF_BUFS;
  
  	if (*size * *count > ZR364XX_DEF_BUFS * 1024 * 1024)
  		*count = (ZR364XX_DEF_BUFS * 1024 * 1024) / *size;
  
  	return 0;
  }
  
  static void free_buffer(struct videobuf_queue *vq, struct zr364xx_buffer *buf)
  {
  	_DBG("%s\n", __func__);
  
  	if (in_interrupt())
  		BUG();
  
  	videobuf_vmalloc_free(&buf->vb);
  	buf->vb.state = VIDEOBUF_NEEDS_INIT;
  }
  
  static int buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
  			  enum v4l2_field field)
  {
  	struct zr364xx_camera *cam = vq->priv_data;
  	struct zr364xx_buffer *buf = container_of(vb, struct zr364xx_buffer,
  						  vb);
  	int rc;
  
  	DBG("%s, field=%d, fmt name = %s\n", __func__, field, cam->fmt != NULL ?
  	    cam->fmt->name : "");
  	if (cam->fmt == NULL)
  		return -EINVAL;
  
  	buf->vb.size = cam->width * cam->height * (cam->fmt->depth >> 3);
  
  	if (buf->vb.baddr != 0 && buf->vb.bsize < buf->vb.size) {
  		DBG("invalid buffer prepare\n");
  		return -EINVAL;
  	}
  
  	buf->fmt = cam->fmt;
  	buf->vb.width = cam->width;
  	buf->vb.height = cam->height;
  	buf->vb.field = field;
  
  	if (buf->vb.state == VIDEOBUF_NEEDS_INIT) {
  		rc = videobuf_iolock(vq, &buf->vb, NULL);
  		if (rc < 0)
  			goto fail;
  	}
  
  	buf->vb.state = VIDEOBUF_PREPARED;
  	return 0;
  fail:
  	free_buffer(vq, buf);
  	return rc;
  }
  
  static void buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
  {
  	struct zr364xx_buffer *buf = container_of(vb, struct zr364xx_buffer,
  						  vb);
  	struct zr364xx_camera *cam = vq->priv_data;
  
  	_DBG("%s\n", __func__);
  
  	buf->vb.state = VIDEOBUF_QUEUED;
  	list_add_tail(&buf->vb.queue, &cam->vidq.active);
  }
  
  static void buffer_release(struct videobuf_queue *vq,
  			   struct videobuf_buffer *vb)
  {
  	struct zr364xx_buffer *buf = container_of(vb, struct zr364xx_buffer,
  						  vb);
  
  	_DBG("%s\n", __func__);
  	free_buffer(vq, buf);
  }
  
  static struct videobuf_queue_ops zr364xx_video_qops = {
  	.buf_setup = buffer_setup,
  	.buf_prepare = buffer_prepare,
  	.buf_queue = buffer_queue,
  	.buf_release = buffer_release,
  };
  
  /********************/
  /* V4L2 integration */
  /********************/
  static int zr364xx_vidioc_streamon(struct file *file, void *priv,
  				   enum v4l2_buf_type type);
  
  static ssize_t zr364xx_read(struct file *file, char __user *buf, size_t count,
  			    loff_t * ppos)
  {
  	struct zr364xx_camera *cam = video_drvdata(file);
  
  	_DBG("%s\n", __func__);
  
  	if (!buf)
  		return -EINVAL;
  
  	if (!count)
  		return -EINVAL;
  
  	if (cam->type == V4L2_BUF_TYPE_VIDEO_CAPTURE &&
  	    zr364xx_vidioc_streamon(file, cam, cam->type) == 0) {
  		DBG("%s: reading %d bytes at pos %d.\n", __func__, (int) count,
  		    (int) *ppos);
  
  		/* NoMan Sux ! */
  		return videobuf_read_one(&cam->vb_vidq, buf, count, ppos,
  					file->f_flags & O_NONBLOCK);
  	}
  
  	return 0;
  }
  
  /* video buffer vmalloc implementation based partly on VIVI driver which is
   *          Copyright (c) 2006 by
   *                  Mauro Carvalho Chehab <mchehab--a.t--infradead.org>
   *                  Ted Walther <ted--a.t--enumera.com>
   *                  John Sokol <sokol--a.t--videotechnology.com>
   *                  http://v4l.videotechnology.com/
   *
   */
  static void zr364xx_fillbuff(struct zr364xx_camera *cam,
  			     struct zr364xx_buffer *buf,
  			     int jpgsize)
  {
  	int pos = 0;
  	struct timeval ts;
  	const char *tmpbuf;
  	char *vbuf = videobuf_to_vmalloc(&buf->vb);
  	unsigned long last_frame;
  	struct zr364xx_framei *frm;
  
  	if (!vbuf)
  		return;
  
  	last_frame = cam->last_frame;
  	if (last_frame != -1) {
  		frm = &cam->buffer.frame[last_frame];
  		tmpbuf = (const char *)cam->buffer.frame[last_frame].lpvbits;
  		switch (buf->fmt->fourcc) {
  		case V4L2_PIX_FMT_JPEG:
  			buf->vb.size = jpgsize;
  			memcpy(vbuf, tmpbuf, buf->vb.size);
  			break;
  		default:
  			printk(KERN_DEBUG KBUILD_MODNAME ": unknown format?\n");
  		}
  		cam->last_frame = -1;
  	} else {
  		printk(KERN_ERR KBUILD_MODNAME ": =======no frame\n");
  		return;
  	}
  	DBG("%s: Buffer 0x%08lx size= %d\n", __func__,
  		(unsigned long)vbuf, pos);
  	/* tell v4l buffer was filled */
  
  	buf->vb.field_count = cam->frame_count * 2;
  	do_gettimeofday(&ts);
  	buf->vb.ts = ts;
  	buf->vb.state = VIDEOBUF_DONE;
  }
  
  static int zr364xx_got_frame(struct zr364xx_camera *cam, int jpgsize)
  {
  	struct zr364xx_dmaqueue *dma_q = &cam->vidq;
  	struct zr364xx_buffer *buf;
  	unsigned long flags = 0;
  	int rc = 0;
  
  	DBG("wakeup: %p\n", &dma_q);
  	spin_lock_irqsave(&cam->slock, flags);
  
  	if (list_empty(&dma_q->active)) {
  		DBG("No active queue to serve\n");
  		rc = -1;
  		goto unlock;
  	}
  	buf = list_entry(dma_q->active.next,
  			 struct zr364xx_buffer, vb.queue);
  
  	if (!waitqueue_active(&buf->vb.done)) {
  		/* no one active */
  		rc = -1;
  		goto unlock;
  	}
  	list_del(&buf->vb.queue);
  	do_gettimeofday(&buf->vb.ts);
  	DBG("[%p/%d] wakeup\n", buf, buf->vb.i);
  	zr364xx_fillbuff(cam, buf, jpgsize);
  	wake_up(&buf->vb.done);
  	DBG("wakeup [buf/i] [%p/%d]\n", buf, buf->vb.i);
  unlock:
  	spin_unlock_irqrestore(&cam->slock, flags);
  	return 0;
  }
  
  /* this function moves the usb stream read pipe data
   * into the system buffers.
   * returns 0 on success, EAGAIN if more data to process (call this
   * function again).
   */
  static int zr364xx_read_video_callback(struct zr364xx_camera *cam,
  					struct zr364xx_pipeinfo *pipe_info,
  					struct urb *purb)
  {
  	unsigned char *pdest;
  	unsigned char *psrc;
  	s32 idx = -1;
  	struct zr364xx_framei *frm;
  	int i = 0;
  	unsigned char *ptr = NULL;
  
  	_DBG("buffer to user\n");
  	idx = cam->cur_frame;
  	frm = &cam->buffer.frame[idx];
  
  	/* swap bytes if camera needs it */
  	if (cam->method == METHOD0) {
  		u16 *buf = (u16 *)pipe_info->transfer_buffer;
  		for (i = 0; i < purb->actual_length/2; i++)
  			swab16s(buf + i);
  	}
  
  	/* search done.  now find out if should be acquiring */
  	if (!cam->b_acquire) {
  		/* we found a frame, but this channel is turned off */
  		frm->ulState = ZR364XX_READ_IDLE;
  		return -EINVAL;
  	}
  
  	psrc = (u8 *)pipe_info->transfer_buffer;
  	ptr = pdest = frm->lpvbits;
  
  	if (frm->ulState == ZR364XX_READ_IDLE) {
  		frm->ulState = ZR364XX_READ_FRAME;
  		frm->cur_size = 0;
  
  		_DBG("jpeg header, ");
  		memcpy(ptr, header1, sizeof(header1));
  		ptr += sizeof(header1);
  		header3 = 0;
  		memcpy(ptr, &header3, 1);
  		ptr++;
  		memcpy(ptr, psrc, 64);
  		ptr += 64;
  		header3 = 1;
  		memcpy(ptr, &header3, 1);
  		ptr++;
  		memcpy(ptr, psrc + 64, 64);
  		ptr += 64;
  		memcpy(ptr, header2, sizeof(header2));
  		ptr += sizeof(header2);
  		memcpy(ptr, psrc + 128,
  		       purb->actual_length - 128);
  		ptr += purb->actual_length - 128;
  		_DBG("header : %d %d %d %d %d %d %d %d %d\n",
  		    psrc[0], psrc[1], psrc[2],
  		    psrc[3], psrc[4], psrc[5],
  		    psrc[6], psrc[7], psrc[8]);
  		frm->cur_size = ptr - pdest;
  	} else {
  		if (frm->cur_size + purb->actual_length > MAX_FRAME_SIZE) {
  			dev_info(&cam->udev->dev,
  				 "%s: buffer (%d bytes) too small to hold "
  				 "frame data. Discarding frame data.\n",
  				 __func__, MAX_FRAME_SIZE);
  		} else {
  			pdest += frm->cur_size;
  			memcpy(pdest, psrc, purb->actual_length);
  			frm->cur_size += purb->actual_length;
  		}
  	}
  	/*_DBG("cur_size %lu urb size %d\n", frm->cur_size,
  		purb->actual_length);*/
  
  	if (purb->actual_length < pipe_info->transfer_size) {
  		_DBG("****************Buffer[%d]full*************\n", idx);
  		cam->last_frame = cam->cur_frame;
  		cam->cur_frame++;
  		/* end of system frame ring buffer, start at zero */
  		if (cam->cur_frame == cam->buffer.dwFrames)
  			cam->cur_frame = 0;
  
  		/* frame ready */
  		/* go back to find the JPEG EOI marker */
  		ptr = pdest = frm->lpvbits;
  		ptr += frm->cur_size - 2;
  		while (ptr > pdest) {
  			if (*ptr == 0xFF && *(ptr + 1) == 0xD9
  			    && *(ptr + 2) == 0xFF)
  				break;
  			ptr--;
  		}
  		if (ptr == pdest)
  			DBG("No EOI marker\n");
  
  		/* Sometimes there is junk data in the middle of the picture,
  		 * we want to skip this bogus frames */
  		while (ptr > pdest) {
  			if (*ptr == 0xFF && *(ptr + 1) == 0xFF
  			    && *(ptr + 2) == 0xFF)
  				break;
  			ptr--;
  		}
  		if (ptr != pdest) {
  			DBG("Bogus frame ? %d\n", ++(cam->nb));
  		} else if (cam->b_acquire) {
  			/* we skip the 2 first frames which are usually buggy */
  			if (cam->skip)
  				cam->skip--;
  			else {
  				_DBG("jpeg(%lu): %d %d %d %d %d %d %d %d\n",
  				    frm->cur_size,
  				    pdest[0], pdest[1], pdest[2], pdest[3],
  				    pdest[4], pdest[5], pdest[6], pdest[7]);
  
  				zr364xx_got_frame(cam, frm->cur_size);
  			}
  		}
  		cam->frame_count++;
  		frm->ulState = ZR364XX_READ_IDLE;
  		frm->cur_size = 0;
  	}
  	/* done successfully */
  	return 0;
  }
  
  static int res_get(struct zr364xx_camera *cam)
  {
  	/* is it free? */
  	mutex_lock(&cam->lock);
  	if (cam->resources) {
  		/* no, someone else uses it */
  		mutex_unlock(&cam->lock);
  		return 0;
  	}
  	/* it's free, grab it */
  	cam->resources = 1;
  	_DBG("res: get\n");
  	mutex_unlock(&cam->lock);
  	return 1;
  }
  
  static inline int res_check(struct zr364xx_camera *cam)
  {
  	return cam->resources;
  }
  
  static void res_free(struct zr364xx_camera *cam)
  {
  	mutex_lock(&cam->lock);
  	cam->resources = 0;
  	mutex_unlock(&cam->lock);
  	_DBG("res: put\n");
  }
  
  static int zr364xx_vidioc_querycap(struct file *file, void *priv,
  				   struct v4l2_capability *cap)
  {
  	struct zr364xx_camera *cam = video_drvdata(file);
  
  	strlcpy(cap->driver, DRIVER_DESC, sizeof(cap->driver));
  	strlcpy(cap->card, cam->udev->product, sizeof(cap->card));
  	strlcpy(cap->bus_info, dev_name(&cam->udev->dev),
  		sizeof(cap->bus_info));
  	cap->version = ZR364XX_VERSION_CODE;
  	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE |
  			    V4L2_CAP_READWRITE |
  			    V4L2_CAP_STREAMING;
  
  	return 0;
  }
  
  static int zr364xx_vidioc_enum_input(struct file *file, void *priv,
  				     struct v4l2_input *i)
  {
  	if (i->index != 0)
  		return -EINVAL;
  	strcpy(i->name, DRIVER_DESC " Camera");
  	i->type = V4L2_INPUT_TYPE_CAMERA;
  	return 0;
  }
  
  static int zr364xx_vidioc_g_input(struct file *file, void *priv,
  				  unsigned int *i)
  {
  	*i = 0;
  	return 0;
  }
  
  static int zr364xx_vidioc_s_input(struct file *file, void *priv,
  				  unsigned int i)
  {
  	if (i != 0)
  		return -EINVAL;
  	return 0;
  }
  
  static int zr364xx_vidioc_queryctrl(struct file *file, void *priv,
  				    struct v4l2_queryctrl *c)
  {
  	struct zr364xx_camera *cam;
  
  	if (file == NULL)
  		return -ENODEV;
  	cam = video_drvdata(file);
  
  	switch (c->id) {
  	case V4L2_CID_BRIGHTNESS:
  		c->type = V4L2_CTRL_TYPE_INTEGER;
  		strcpy(c->name, "Brightness");
  		c->minimum = 0;
  		c->maximum = 127;
  		c->step = 1;
  		c->default_value = cam->mode.brightness;
  		c->flags = 0;
  		break;
  	default:
  		return -EINVAL;
  	}
  	return 0;
  }
  
  static int zr364xx_vidioc_s_ctrl(struct file *file, void *priv,
  				 struct v4l2_control *c)
  {
  	struct zr364xx_camera *cam;
  	int temp;
  
  	if (file == NULL)
  		return -ENODEV;
  	cam = video_drvdata(file);
  
  	switch (c->id) {
  	case V4L2_CID_BRIGHTNESS:
  		cam->mode.brightness = c->value;
  		/* hardware brightness */
  		mutex_lock(&cam->lock);
  		send_control_msg(cam->udev, 1, 0x2001, 0, NULL, 0);
  		temp = (0x60 << 8) + 127 - cam->mode.brightness;
  		send_control_msg(cam->udev, 1, temp, 0, NULL, 0);
  		mutex_unlock(&cam->lock);
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int zr364xx_vidioc_g_ctrl(struct file *file, void *priv,
  				 struct v4l2_control *c)
  {
  	struct zr364xx_camera *cam;
  
  	if (file == NULL)
  		return -ENODEV;
  	cam = video_drvdata(file);
  
  	switch (c->id) {
  	case V4L2_CID_BRIGHTNESS:
  		c->value = cam->mode.brightness;
  		break;
  	default:
  		return -EINVAL;
  	}
  	return 0;
  }
  
  static int zr364xx_vidioc_enum_fmt_vid_cap(struct file *file,
  				       void *priv, struct v4l2_fmtdesc *f)
  {
  	if (f->index > 0)
  		return -EINVAL;
  	f->flags = V4L2_FMT_FLAG_COMPRESSED;
  	strcpy(f->description, formats[0].name);
  	f->pixelformat = formats[0].fourcc;
  	return 0;
  }
  
  static char *decode_fourcc(__u32 pixelformat, char *buf)
  {
  	buf[0] = pixelformat & 0xff;
  	buf[1] = (pixelformat >> 8) & 0xff;
  	buf[2] = (pixelformat >> 16) & 0xff;
  	buf[3] = (pixelformat >> 24) & 0xff;
  	buf[4] = '\0';
  	return buf;
  }
  
  static int zr364xx_vidioc_try_fmt_vid_cap(struct file *file, void *priv,
  				      struct v4l2_format *f)
  {
  	struct zr364xx_camera *cam = video_drvdata(file);
  	char pixelformat_name[5];
  
  	if (cam == NULL)
  		return -ENODEV;
  
  	if (f->fmt.pix.pixelformat != V4L2_PIX_FMT_JPEG) {
  		DBG("%s: unsupported pixelformat V4L2_PIX_FMT_%s\n", __func__,
  		    decode_fourcc(f->fmt.pix.pixelformat, pixelformat_name));
  		return -EINVAL;
  	}
  
  	if (!(f->fmt.pix.width == 160 && f->fmt.pix.height == 120) &&
  	    !(f->fmt.pix.width == 640 && f->fmt.pix.height == 480)) {
  		f->fmt.pix.width = 320;
  		f->fmt.pix.height = 240;
  	}
  
  	f->fmt.pix.field = V4L2_FIELD_NONE;
  	f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
  	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
  	f->fmt.pix.colorspace = 0;
  	f->fmt.pix.priv = 0;
  	DBG("%s: V4L2_PIX_FMT_%s (%d) ok!\n", __func__,
  	    decode_fourcc(f->fmt.pix.pixelformat, pixelformat_name),
  	    f->fmt.pix.field);
  	return 0;
  }
  
  static int zr364xx_vidioc_g_fmt_vid_cap(struct file *file, void *priv,
  				    struct v4l2_format *f)
  {
  	struct zr364xx_camera *cam;
  
  	if (file == NULL)
  		return -ENODEV;
  	cam = video_drvdata(file);
  
  	f->fmt.pix.pixelformat = formats[0].fourcc;
  	f->fmt.pix.field = V4L2_FIELD_NONE;
  	f->fmt.pix.width = cam->width;
  	f->fmt.pix.height = cam->height;
  	f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
  	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
  	f->fmt.pix.colorspace = 0;
  	f->fmt.pix.priv = 0;
  	return 0;
  }
  
  static int zr364xx_vidioc_s_fmt_vid_cap(struct file *file, void *priv,
  				    struct v4l2_format *f)
  {
  	struct zr364xx_camera *cam = video_drvdata(file);
  	struct videobuf_queue *q = &cam->vb_vidq;
  	char pixelformat_name[5];
  	int ret = zr364xx_vidioc_try_fmt_vid_cap(file, cam, f);
  	int i;
  
  	if (ret < 0)
  		return ret;
  
  	mutex_lock(&q->vb_lock);
  
  	if (videobuf_queue_is_busy(&cam->vb_vidq)) {
  		DBG("%s queue busy\n", __func__);
  		ret = -EBUSY;
  		goto out;
  	}
  
  	if (res_check(cam)) {
  		DBG("%s can't change format after started\n", __func__);
  		ret = -EBUSY;
  		goto out;
  	}
  
  	cam->width = f->fmt.pix.width;
  	cam->height = f->fmt.pix.height;
  	dev_info(&cam->udev->dev, "%s: %dx%d mode selected\n", __func__,
  		 cam->width, cam->height);
  	f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
  	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
  	f->fmt.pix.colorspace = 0;
  	f->fmt.pix.priv = 0;
  	cam->vb_vidq.field = f->fmt.pix.field;
  	cam->mode.color = V4L2_PIX_FMT_JPEG;
  
  	if (f->fmt.pix.width == 160 && f->fmt.pix.height == 120)
  		mode = 1;
  	else if (f->fmt.pix.width == 640 && f->fmt.pix.height == 480)
  		mode = 2;
  	else
  		mode = 0;
  
  	m0d1[0] = mode;
  	m1[2].value = 0xf000 + mode;
  	m2[1].value = 0xf000 + mode;
  
  	/* special case for METHOD3, the modes are different */
  	if (cam->method == METHOD3) {
  		switch (mode) {
  		case 1:
  			m2[1].value = 0xf000 + 4;
  			break;
  		case 2:
  			m2[1].value = 0xf000 + 0;
  			break;
  		default:
  			m2[1].value = 0xf000 + 1;
  			break;
  		}
  	}
  
  	header2[437] = cam->height / 256;
  	header2[438] = cam->height % 256;
  	header2[439] = cam->width / 256;
  	header2[440] = cam->width % 256;
  
  	for (i = 0; init[cam->method][i].size != -1; i++) {
  		ret =
  		    send_control_msg(cam->udev, 1, init[cam->method][i].value,
  				     0, init[cam->method][i].bytes,
  				     init[cam->method][i].size);
  		if (ret < 0) {
  			dev_err(&cam->udev->dev,
  			   "error during resolution change sequence: %d\n", i);
  			goto out;
  		}
  	}
  
  	/* Added some delay here, since opening/closing the camera quickly,
  	 * like Ekiga does during its startup, can crash the webcam
  	 */
  	mdelay(100);
  	cam->skip = 2;
  	ret = 0;
  
  out:
  	mutex_unlock(&q->vb_lock);
  
  	DBG("%s: V4L2_PIX_FMT_%s (%d) ok!\n", __func__,
  	    decode_fourcc(f->fmt.pix.pixelformat, pixelformat_name),
  	    f->fmt.pix.field);
  	return ret;
  }
  
  static int zr364xx_vidioc_reqbufs(struct file *file, void *priv,
  			  struct v4l2_requestbuffers *p)
  {
  	int rc;
  	struct zr364xx_camera *cam = video_drvdata(file);
  	rc = videobuf_reqbufs(&cam->vb_vidq, p);
  	return rc;
  }
  
  static int zr364xx_vidioc_querybuf(struct file *file,
  				void *priv,
  				struct v4l2_buffer *p)
  {
  	int rc;
  	struct zr364xx_camera *cam = video_drvdata(file);
  	rc = videobuf_querybuf(&cam->vb_vidq, p);
  	return rc;
  }
  
  static int zr364xx_vidioc_qbuf(struct file *file,
  				void *priv,
  				struct v4l2_buffer *p)
  {
  	int rc;
  	struct zr364xx_camera *cam = video_drvdata(file);
  	_DBG("%s\n", __func__);
  	rc = videobuf_qbuf(&cam->vb_vidq, p);
  	return rc;
  }
  
  static int zr364xx_vidioc_dqbuf(struct file *file,
  				void *priv,
  				struct v4l2_buffer *p)
  {
  	int rc;
  	struct zr364xx_camera *cam = video_drvdata(file);
  	_DBG("%s\n", __func__);
  	rc = videobuf_dqbuf(&cam->vb_vidq, p, file->f_flags & O_NONBLOCK);
  	return rc;
  }
  
  static void read_pipe_completion(struct urb *purb)
  {
  	struct zr364xx_pipeinfo *pipe_info;
  	struct zr364xx_camera *cam;
  	int pipe;
  
  	pipe_info = purb->context;
  	_DBG("%s %p, status %d\n", __func__, purb, purb->status);
  	if (pipe_info == NULL) {
  		printk(KERN_ERR KBUILD_MODNAME ": no context!\n");
  		return;
  	}
  
  	cam = pipe_info->cam;
  	if (cam == NULL) {
  		printk(KERN_ERR KBUILD_MODNAME ": no context!\n");
  		return;
  	}
  
  	/* if shutting down, do not resubmit, exit immediately */
  	if (purb->status == -ESHUTDOWN) {
  		DBG("%s, err shutdown\n", __func__);
  		pipe_info->err_count++;
  		return;
  	}
  
  	if (pipe_info->state == 0) {
  		DBG("exiting USB pipe\n");
  		return;
  	}
  
  	if (purb->actual_length < 0 ||
  	    purb->actual_length > pipe_info->transfer_size) {
  		dev_err(&cam->udev->dev, "wrong number of bytes\n");
  		return;
  	}
  
  	if (purb->status == 0)
  		zr364xx_read_video_callback(cam, pipe_info, purb);
  	else {
  		pipe_info->err_count++;
  		DBG("%s: failed URB %d\n", __func__, purb->status);
  	}
  
  	pipe = usb_rcvbulkpipe(cam->udev, cam->read_endpoint);
  
  	/* reuse urb */
  	usb_fill_bulk_urb(pipe_info->stream_urb, cam->udev,
  			  pipe,
  			  pipe_info->transfer_buffer,
  			  pipe_info->transfer_size,
  			  read_pipe_completion, pipe_info);
  
  	if (pipe_info->state != 0) {
  		purb->status = usb_submit_urb(pipe_info->stream_urb,
  					      GFP_ATOMIC);
  
  		if (purb->status)
  			dev_err(&cam->udev->dev,
  				"error submitting urb (error=%i)\n",
  				purb->status);
  	} else
  		DBG("read pipe complete state 0\n");
  }
  
  static int zr364xx_start_readpipe(struct zr364xx_camera *cam)
  {
  	int pipe;
  	int retval;
  	struct zr364xx_pipeinfo *pipe_info = cam->pipe;
  	pipe = usb_rcvbulkpipe(cam->udev, cam->read_endpoint);
  	DBG("%s: start pipe IN x%x\n", __func__, cam->read_endpoint);
  
  	pipe_info->state = 1;
  	pipe_info->err_count = 0;
  	pipe_info->stream_urb = usb_alloc_urb(0, GFP_KERNEL);
  	if (!pipe_info->stream_urb) {
  		dev_err(&cam->udev->dev, "ReadStream: Unable to alloc URB\n");
  		return -ENOMEM;
  	}
  	/* transfer buffer allocated in board_init */
  	usb_fill_bulk_urb(pipe_info->stream_urb, cam->udev,
  			  pipe,
  			  pipe_info->transfer_buffer,
  			  pipe_info->transfer_size,
  			  read_pipe_completion, pipe_info);
  
  	DBG("submitting URB %p\n", pipe_info->stream_urb);
  	retval = usb_submit_urb(pipe_info->stream_urb, GFP_KERNEL);
  	if (retval) {
  		printk(KERN_ERR KBUILD_MODNAME ": start read pipe failed\n");
  		return retval;
  	}
  
  	return 0;
  }
  
  static void zr364xx_stop_readpipe(struct zr364xx_camera *cam)
  {
  	struct zr364xx_pipeinfo *pipe_info;
  
  	if (cam == NULL) {
  		printk(KERN_ERR KBUILD_MODNAME ": invalid device\n");
  		return;
  	}
  	DBG("stop read pipe\n");
  	pipe_info = cam->pipe;
  	if (pipe_info) {
  		if (pipe_info->state != 0)
  			pipe_info->state = 0;
  
  		if (pipe_info->stream_urb) {
  			/* cancel urb */
  			usb_kill_urb(pipe_info->stream_urb);
  			usb_free_urb(pipe_info->stream_urb);
  			pipe_info->stream_urb = NULL;
  		}
  	}
  	return;
  }
  
  /* starts acquisition process */
  static int zr364xx_start_acquire(struct zr364xx_camera *cam)
  {
  	int j;
  
  	DBG("start acquire\n");
  
  	cam->last_frame = -1;
  	cam->cur_frame = 0;
  	for (j = 0; j < FRAMES; j++) {
  		cam->buffer.frame[j].ulState = ZR364XX_READ_IDLE;
  		cam->buffer.frame[j].cur_size = 0;
  	}
  	cam->b_acquire = 1;
  	return 0;
  }
  
  static inline int zr364xx_stop_acquire(struct zr364xx_camera *cam)
  {
  	cam->b_acquire = 0;
  	return 0;
  }
  
  static int zr364xx_vidioc_streamon(struct file *file, void *priv,
  				   enum v4l2_buf_type type)
  {
  	struct zr364xx_camera *cam = video_drvdata(file);
  	int j;
  	int res;
  
  	DBG("%s\n", __func__);
  
  	if (cam->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
  		dev_err(&cam->udev->dev, "invalid fh type0\n");
  		return -EINVAL;
  	}
  	if (cam->type != type) {
  		dev_err(&cam->udev->dev, "invalid fh type1\n");
  		return -EINVAL;
  	}
  
  	if (!res_get(cam)) {
  		dev_err(&cam->udev->dev, "stream busy\n");
  		return -EBUSY;
  	}
  
  	cam->last_frame = -1;
  	cam->cur_frame = 0;
  	cam->frame_count = 0;
  	for (j = 0; j < FRAMES; j++) {
  		cam->buffer.frame[j].ulState = ZR364XX_READ_IDLE;
  		cam->buffer.frame[j].cur_size = 0;
  	}
  	res = videobuf_streamon(&cam->vb_vidq);
  	if (res == 0) {
  		zr364xx_start_acquire(cam);
  	} else {
  		res_free(cam);
  	}
  	return res;
  }
  
  static int zr364xx_vidioc_streamoff(struct file *file, void *priv,
  				    enum v4l2_buf_type type)
  {
  	int res;
  	struct zr364xx_camera *cam = video_drvdata(file);
  
  	DBG("%s\n", __func__);
  	if (cam->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
  		dev_err(&cam->udev->dev, "invalid fh type0\n");
  		return -EINVAL;
  	}
  	if (cam->type != type) {
  		dev_err(&cam->udev->dev, "invalid fh type1\n");
  		return -EINVAL;
  	}
  	zr364xx_stop_acquire(cam);
  	res = videobuf_streamoff(&cam->vb_vidq);
  	if (res < 0)
  		return res;
  	res_free(cam);
  	return 0;
  }
  
  
  /* open the camera */
  static int zr364xx_open(struct file *file)
  {
  	struct video_device *vdev = video_devdata(file);
  	struct zr364xx_camera *cam = video_drvdata(file);
  	struct usb_device *udev = cam->udev;
  	int i, err;
  
  	DBG("%s\n", __func__);
  
  	mutex_lock(&cam->open_lock);
  
  	if (cam->users) {
  		err = -EBUSY;
  		goto out;
  	}
  
  	for (i = 0; init[cam->method][i].size != -1; i++) {
  		err =
  		    send_control_msg(udev, 1, init[cam->method][i].value,
  				     0, init[cam->method][i].bytes,
  				     init[cam->method][i].size);
  		if (err < 0) {
  			dev_err(&cam->udev->dev,
  				"error during open sequence: %d\n", i);
  			goto out;
  		}
  	}
  
  	cam->skip = 2;
  	cam->users++;
  	file->private_data = vdev;
  	cam->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
  	cam->fmt = formats;
  
  	videobuf_queue_vmalloc_init(&cam->vb_vidq, &zr364xx_video_qops,
  				    NULL, &cam->slock,
  				    cam->type,
  				    V4L2_FIELD_NONE,
  				    sizeof(struct zr364xx_buffer), cam);
  
  	/* Added some delay here, since opening/closing the camera quickly,
  	 * like Ekiga does during its startup, can crash the webcam
  	 */
  	mdelay(100);
  	err = 0;
  
  out:
  	mutex_unlock(&cam->open_lock);
  	DBG("%s: %d\n", __func__, err);
  	return err;
  }
  
  static void zr364xx_destroy(struct zr364xx_camera *cam)
  {
  	unsigned long i;
  
  	if (!cam) {
  		printk(KERN_ERR KBUILD_MODNAME ", %s: no device\n", __func__);
  		return;
  	}
  	mutex_lock(&cam->open_lock);
  	if (cam->vdev)
  		video_unregister_device(cam->vdev);
  	cam->vdev = NULL;
  
  	/* stops the read pipe if it is running */
  	if (cam->b_acquire)
  		zr364xx_stop_acquire(cam);
  
  	zr364xx_stop_readpipe(cam);
  
  	/* release sys buffers */
  	for (i = 0; i < FRAMES; i++) {
  		if (cam->buffer.frame[i].lpvbits) {
  			DBG("vfree %p\n", cam->buffer.frame[i].lpvbits);
  			vfree(cam->buffer.frame[i].lpvbits);
  		}
  		cam->buffer.frame[i].lpvbits = NULL;
  	}
  
  	/* release transfer buffer */
  	kfree(cam->pipe->transfer_buffer);
  	cam->pipe->transfer_buffer = NULL;
  	mutex_unlock(&cam->open_lock);
  	kfree(cam);
  	cam = NULL;
  }
  
  /* release the camera */
  static int zr364xx_release(struct file *file)
  {
  	struct zr364xx_camera *cam;
  	struct usb_device *udev;
  	int i, err;
  
  	DBG("%s\n", __func__);
  	cam = video_drvdata(file);
  
  	if (!cam)
  		return -ENODEV;
  
  	mutex_lock(&cam->open_lock);
  	udev = cam->udev;
  
  	/* turn off stream */
  	if (res_check(cam)) {
  		if (cam->b_acquire)
  			zr364xx_stop_acquire(cam);
  		videobuf_streamoff(&cam->vb_vidq);
  		res_free(cam);
  	}
  
  	cam->users--;
  	file->private_data = NULL;
  
  	for (i = 0; i < 2; i++) {
  		err =
  		    send_control_msg(udev, 1, init[cam->method][i].value,
  				     0, init[cam->method][i].bytes,
  				     init[cam->method][i].size);
  		if (err < 0) {
  			dev_err(&udev->dev, "error during release sequence\n");
  			goto out;
  		}
  	}
  
  	/* Added some delay here, since opening/closing the camera quickly,
  	 * like Ekiga does during its startup, can crash the webcam
  	 */
  	mdelay(100);
  	err = 0;
  
  out:
  	mutex_unlock(&cam->open_lock);
  
  	return err;
  }
  
  
  static int zr364xx_mmap(struct file *file, struct vm_area_struct *vma)
  {
  	struct zr364xx_camera *cam = video_drvdata(file);
  	int ret;
  
  	if (cam == NULL) {
  		DBG("%s: cam == NULL\n", __func__);
  		return -ENODEV;
  	}
  	DBG("mmap called, vma=0x%08lx\n", (unsigned long)vma);
  
  	ret = videobuf_mmap_mapper(&cam->vb_vidq, vma);
  
  	DBG("vma start=0x%08lx, size=%ld, ret=%d\n",
  		(unsigned long)vma->vm_start,
  		(unsigned long)vma->vm_end - (unsigned long)vma->vm_start, ret);
  	return ret;
  }
  
  static unsigned int zr364xx_poll(struct file *file,
  			       struct poll_table_struct *wait)
  {
  	struct zr364xx_camera *cam = video_drvdata(file);
  	struct videobuf_queue *q = &cam->vb_vidq;
  	_DBG("%s\n", __func__);
  
  	if (cam->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
  		return POLLERR;
  
  	return videobuf_poll_stream(file, q, wait);
  }
  
  static const struct v4l2_file_operations zr364xx_fops = {
  	.owner = THIS_MODULE,
  	.open = zr364xx_open,
  	.release = zr364xx_release,
  	.read = zr364xx_read,
  	.mmap = zr364xx_mmap,
  	.ioctl = video_ioctl2,
  	.poll = zr364xx_poll,
  };
  
  static const struct v4l2_ioctl_ops zr364xx_ioctl_ops = {
  	.vidioc_querycap	= zr364xx_vidioc_querycap,
  	.vidioc_enum_fmt_vid_cap = zr364xx_vidioc_enum_fmt_vid_cap,
  	.vidioc_try_fmt_vid_cap	= zr364xx_vidioc_try_fmt_vid_cap,
  	.vidioc_s_fmt_vid_cap	= zr364xx_vidioc_s_fmt_vid_cap,
  	.vidioc_g_fmt_vid_cap	= zr364xx_vidioc_g_fmt_vid_cap,
  	.vidioc_enum_input	= zr364xx_vidioc_enum_input,
  	.vidioc_g_input		= zr364xx_vidioc_g_input,
  	.vidioc_s_input		= zr364xx_vidioc_s_input,
  	.vidioc_streamon	= zr364xx_vidioc_streamon,
  	.vidioc_streamoff	= zr364xx_vidioc_streamoff,
  	.vidioc_queryctrl	= zr364xx_vidioc_queryctrl,
  	.vidioc_g_ctrl		= zr364xx_vidioc_g_ctrl,
  	.vidioc_s_ctrl		= zr364xx_vidioc_s_ctrl,
  	.vidioc_reqbufs         = zr364xx_vidioc_reqbufs,
  	.vidioc_querybuf        = zr364xx_vidioc_querybuf,
  	.vidioc_qbuf            = zr364xx_vidioc_qbuf,
  	.vidioc_dqbuf           = zr364xx_vidioc_dqbuf,
  };
  
  static struct video_device zr364xx_template = {
  	.name = DRIVER_DESC,
  	.fops = &zr364xx_fops,
  	.ioctl_ops = &zr364xx_ioctl_ops,
  	.release = video_device_release,
  };
  
  
  
  /*******************/
  /* USB integration */
  /*******************/
  static int zr364xx_board_init(struct zr364xx_camera *cam)
  {
  	struct zr364xx_pipeinfo *pipe = cam->pipe;
  	unsigned long i;
  
  	DBG("board init: %p\n", cam);
  	memset(pipe, 0, sizeof(*pipe));
  	pipe->cam = cam;
  	pipe->transfer_size = BUFFER_SIZE;
  
  	pipe->transfer_buffer = kzalloc(pipe->transfer_size,
  					GFP_KERNEL);
  	if (pipe->transfer_buffer == NULL) {
  		DBG("out of memory!\n");
  		return -ENOMEM;
  	}
  
  	cam->b_acquire = 0;
  	cam->frame_count = 0;
  
  	/*** start create system buffers ***/
  	for (i = 0; i < FRAMES; i++) {
  		/* always allocate maximum size for system buffers */
  		cam->buffer.frame[i].lpvbits = vmalloc(MAX_FRAME_SIZE);
  
  		DBG("valloc %p, idx %lu, pdata %p\n",
  			&cam->buffer.frame[i], i,
  			cam->buffer.frame[i].lpvbits);
  		if (cam->buffer.frame[i].lpvbits == NULL) {
  			printk(KERN_INFO KBUILD_MODNAME ": out of memory. "
  			       "Using less frames\n");
  			break;
  		}
  	}
  
  	if (i == 0) {
  		printk(KERN_INFO KBUILD_MODNAME ": out of memory. Aborting\n");
  		kfree(cam->pipe->transfer_buffer);
  		cam->pipe->transfer_buffer = NULL;
  		return -ENOMEM;
  	} else
  		cam->buffer.dwFrames = i;
  
  	/* make sure internal states are set */
  	for (i = 0; i < FRAMES; i++) {
  		cam->buffer.frame[i].ulState = ZR364XX_READ_IDLE;
  		cam->buffer.frame[i].cur_size = 0;
  	}
  
  	cam->cur_frame = 0;
  	cam->last_frame = -1;
  	/*** end create system buffers ***/
  
  	/* start read pipe */
  	zr364xx_start_readpipe(cam);
  	DBG(": board initialized\n");
  	return 0;
  }
  
  static int zr364xx_probe(struct usb_interface *intf,
  			 const struct usb_device_id *id)
  {
  	struct usb_device *udev = interface_to_usbdev(intf);
  	struct zr364xx_camera *cam = NULL;
  	struct usb_host_interface *iface_desc;
  	struct usb_endpoint_descriptor *endpoint;
  	int err;
  	int i;
  
  	DBG("probing...\n");
  
  	dev_info(&intf->dev, DRIVER_DESC " compatible webcam plugged\n");
  	dev_info(&intf->dev, "model %04x:%04x detected\n",
  		 le16_to_cpu(udev->descriptor.idVendor),
  		 le16_to_cpu(udev->descriptor.idProduct));
  
  	cam = kzalloc(sizeof(struct zr364xx_camera), GFP_KERNEL);
  	if (cam == NULL) {
  		dev_err(&udev->dev, "cam: out of memory !\n");
  		return -ENOMEM;
  	}
  	/* save the init method used by this camera */
  	cam->method = id->driver_info;
  
  	cam->vdev = video_device_alloc();
  	if (cam->vdev == NULL) {
  		dev_err(&udev->dev, "cam->vdev: out of memory !\n");
  		kfree(cam);
  		cam = NULL;
  		return -ENOMEM;
  	}
  	memcpy(cam->vdev, &zr364xx_template, sizeof(zr364xx_template));
  	cam->vdev->parent = &intf->dev;
  	video_set_drvdata(cam->vdev, cam);
  	if (debug)
  		cam->vdev->debug = V4L2_DEBUG_IOCTL | V4L2_DEBUG_IOCTL_ARG;
  
  	cam->udev = udev;
  
  	switch (mode) {
  	case 1:
  		dev_info(&udev->dev, "160x120 mode selected\n");
  		cam->width = 160;
  		cam->height = 120;
  		break;
  	case 2:
  		dev_info(&udev->dev, "640x480 mode selected\n");
  		cam->width = 640;
  		cam->height = 480;
  		break;
  	default:
  		dev_info(&udev->dev, "320x240 mode selected\n");
  		cam->width = 320;
  		cam->height = 240;
  		break;
  	}
  
  	m0d1[0] = mode;
  	m1[2].value = 0xf000 + mode;
  	m2[1].value = 0xf000 + mode;
  
  	/* special case for METHOD3, the modes are different */
  	if (cam->method == METHOD3) {
  		switch (mode) {
  		case 1:
  			m2[1].value = 0xf000 + 4;
  			break;
  		case 2:
  			m2[1].value = 0xf000 + 0;
  			break;
  		default:
  			m2[1].value = 0xf000 + 1;
  			break;
  		}
  	}
  
  	header2[437] = cam->height / 256;
  	header2[438] = cam->height % 256;
  	header2[439] = cam->width / 256;
  	header2[440] = cam->width % 256;
  
  	cam->users = 0;
  	cam->nb = 0;
  	cam->mode.brightness = 64;
  	mutex_init(&cam->lock);
  	mutex_init(&cam->open_lock);
  
  	DBG("dev: %p, udev %p interface %p\n", cam, cam->udev, intf);
  
  	/* set up the endpoint information  */
  	iface_desc = intf->cur_altsetting;
  	DBG("num endpoints %d\n", iface_desc->desc.bNumEndpoints);
  	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
  		endpoint = &iface_desc->endpoint[i].desc;
  		if (!cam->read_endpoint && usb_endpoint_is_bulk_in(endpoint)) {
  			/* we found the bulk in endpoint */
  			cam->read_endpoint = endpoint->bEndpointAddress;
  		}
  	}
  
  	if (!cam->read_endpoint) {
  		dev_err(&intf->dev, "Could not find bulk-in endpoint\n");
  		return -ENOMEM;
  	}
  
  	/* v4l */
  	INIT_LIST_HEAD(&cam->vidq.active);
  	cam->vidq.cam = cam;
  	err = video_register_device(cam->vdev, VFL_TYPE_GRABBER, -1);
  	if (err) {
  		dev_err(&udev->dev, "video_register_device failed\n");
  		video_device_release(cam->vdev);
  		kfree(cam);
  		cam = NULL;
  		return err;
  	}
  
  	usb_set_intfdata(intf, cam);
  
  	/* load zr364xx board specific */
  	err = zr364xx_board_init(cam);
  	if (err) {
  		spin_lock_init(&cam->slock);
  		return err;
  	}
  
  	spin_lock_init(&cam->slock);
  
  	dev_info(&udev->dev, DRIVER_DESC " controlling device %s\n",
  		 video_device_node_name(cam->vdev));
  	return 0;
  }
  
  
  static void zr364xx_disconnect(struct usb_interface *intf)
  {
  	struct zr364xx_camera *cam = usb_get_intfdata(intf);
  	videobuf_mmap_free(&cam->vb_vidq);
  	usb_set_intfdata(intf, NULL);
  	dev_info(&intf->dev, DRIVER_DESC " webcam unplugged\n");
  	zr364xx_destroy(cam);
  }
  
  
  
  /**********************/
  /* Module integration */
  /**********************/
  
  static struct usb_driver zr364xx_driver = {
  	.name = "zr364xx",
  	.probe = zr364xx_probe,
  	.disconnect = zr364xx_disconnect,
  	.id_table = device_table
  };
  
  
  static int __init zr364xx_init(void)
  {
  	int retval;
  	retval = usb_register(&zr364xx_driver);
  	if (retval)
  		printk(KERN_ERR KBUILD_MODNAME ": usb_register failed!\n");
  	else
  		printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
  	return retval;
  }
  
  
  static void __exit zr364xx_exit(void)
  {
  	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC " module unloaded\n");
  	usb_deregister(&zr364xx_driver);
  }
  
  
  module_init(zr364xx_init);
  module_exit(zr364xx_exit);
  
  MODULE_AUTHOR(DRIVER_AUTHOR);
  MODULE_DESCRIPTION(DRIVER_DESC);
  MODULE_LICENSE("GPL");
  